字典操作流程

最新推荐文章于 2022-06-13 15:04:20 发布

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最新推荐文章于 2022-06-13 15:04:20 发布

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/jly1/p/9567946.html

本文介绍了Python中数据类型的划分，包括可变与不可变类型，指出字典的键必须是不可变数据类型。还阐述了字典的优点和特点，如二分查找、存储大量数据、无序等。同时详细展示了字典的添加、删除、修改、查找等操作流程。

'''
数据类型划分;可变数据类型\不可变数据类型
不可变:元祖,bool,int str 可哈希
可变:list, dict set  不可哈希
dict key 必须是不可变数据类型
    value 任意数据类型

dict 优点:二分查找
         存储大量数据
    特点:无序的

'''

# dic = {"name":["erge", "suiyue", "tiantian"],
#        "py9" :[{'num':71, "age":18}],
#        True:1,
#        (1,2,3):"wuyiyi",
#        2:"erge"
#        }
# print(dic)
#
# dic1= {"age":18, "name":"jin","sex":"male"}
# print(dic1)
# #add only two
# dic1["high"] = 185 #no is add
# dic1["age"] = 16 #have key change value

# dic1.setdefault("weight")#having no key add
# dic1.setdefault("age", 19)#have key no change
# print(dic1)

#delete

# print(dic1.pop("age")) having return value
# print(dic1.pop("ergao","no key")) not having can return note
# print(dic1)
# dic1.popitem()#random delete
# print(dic1)
# dic1.popitem()
# print(dic1)

# del dic1["name"]
# print(dic1)

# del dic1
# print(dic1)

# dic1.clear()
# print(dic1)

#change
# dic1["age"] = 16 #have key change value
dict = {"name":"jin","age":18,"sex":"male"}
# dic2 = {"name":"alex","weight":75}
# dic2.update(dic)# all update
#
# print(dic)
# print(dic2)

#find  just as list

# print(dict.keys(),type(dict.keys()))
# print(dict.values())
# print(dict.items())

# for i in dict.items():
#     print(i)

# for i in dict.values():
#     print(i)
# a,b = 1,2
# print(a,b)

# a = 1
# b = 2
# print(a,b)

# a,b=[1,2],[2,3]
# print(a,b)
# for k,v in dict.items():
#     print(k,v)

print(dict.get("namel"))

dic = {
    "name":["alex", "wusir", "taibai"],
    'py9':{
        "time":"1213",
        "learn money" : 19800,
        "addr":"CBD"

    },
    "age":21
}

# dic["age"] = 56
# print()
# print(dic["name"])
# dic["name"].append("ritian")
# print(dic["name"])
# dic["name"][1] = dic["name"][1].upper()
# print(dic["name"])

dic["py9"]["female"] = 6

# print(dic)

info = input(">>>")#sjihafdslkjke12jk324jweq23
for i in info:
    if i.isalpha():
        info=info.replace(i," ")

info = info.split()
print(info)
print(len(info))

转载于:https://www.cnblogs.com/jly1/p/9567946.html